EP0102897B1 - Automatische Reinigungsvorrichtung eines Lesekopfes eines Kassettenaufnahmegerätes - Google Patents

Automatische Reinigungsvorrichtung eines Lesekopfes eines Kassettenaufnahmegerätes Download PDF

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Publication number
EP0102897B1
EP0102897B1 EP83401703A EP83401703A EP0102897B1 EP 0102897 B1 EP0102897 B1 EP 0102897B1 EP 83401703 A EP83401703 A EP 83401703A EP 83401703 A EP83401703 A EP 83401703A EP 0102897 B1 EP0102897 B1 EP 0102897B1
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EP
European Patent Office
Prior art keywords
brush
cassette
contact
relay
detecting
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP83401703A
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English (en)
French (fr)
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EP0102897A1 (de
Inventor
Daniel Bouchlaghem
Catherine Berger
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Groupement D'interet Economique Medilec Gie
Original Assignee
Groupement D'interet Economique Medilec Gie
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Application filed by Groupement D'interet Economique Medilec Gie filed Critical Groupement D'interet Economique Medilec Gie
Priority to AT83401703T priority Critical patent/ATE25440T1/de
Publication of EP0102897A1 publication Critical patent/EP0102897A1/de
Application granted granted Critical
Publication of EP0102897B1 publication Critical patent/EP0102897B1/de
Expired legal-status Critical Current

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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/41—Cleaning of heads

Definitions

  • the subject of the present invention is an automatic cleaning device for a magnetic read head of a magnetic tape for a cassette recording device, comprising a retractable brush capable of coming into contact with the read head, means for detecting presence cassette in the device, and retractable brush drive means controlled by the cassette presence detection means in the device.
  • the problem of cleaning the read head is therefore more particularly critical in the case of instrumentation equipment intended for the reproduction and observation of signals whose morphology and level must be reproduced without distortion or modification so as to allow valid comparisons between different signals.
  • Self-cleaning cassettes are already known which provide automatic cleaning of a read head.
  • the efficiency of these cassettes is however not always sufficient and the cost of use can be high because, for cleaning to be effective it is necessary to use self-cleaning cassettes to the exclusion of all other .
  • Also known from patent document US-A-3 595 584 is a device for cleaning the read head of an audio or video device, which comprises a brush which can be driven in rotation by an electric motor. At determined instants, for example during a change of track, the read head is moved away from the magnetic strip and the brush-electric motor assembly is moved in translation to bring the brush into contact with the magnetic head. The brush is then driven in rotation on itself by the associated motor to perform a cleaning of the head, then the brush-motor assembly is again moved away from the read head.
  • Such a device is expensive and complex to produce and does not allow repeated and rapid cleaning to be carried out easily since each cleaning operation involves several operations and the movement of a relatively complex mechanical assembly.
  • the present invention aims specifically to remedy the aforementioned drawbacks and to allow automatic and systematic cleaning of a read head between each reading operation of a cassette in order to guarantee for each new reading perfect integrity of the magnetic head and thus provide a quality of the signal read which remains intact as a function of time.
  • Another object of the invention is to provide a cleaning device which is inexpensive, relatively compact and easily adaptable to existing devices.
  • a cleaning device characterized in that it further comprises brush position sensors constituted by fixed end-of-travel micro-contacts cooperating with a stop secured to a support rod.
  • the brush displaceable perpendicularly to the read head, and switching means associated with said sensors, with means for detecting the presence of a cassette, and with means for driving the retractable brush, to ensure drive in a selective manner in rotation and in translation of the retractable brush on each removal of a cassette, so that the brush has at least one back and forth movement during which it comes into contact with the magnetic head by presenting a rotational movement on it- similarly
  • the drive and transmission means associated with the brush comprise an electric DC motor, a system of pulleys and belt, a nut fi xed guide and a threaded rod secured to a receiving pulley, and secondly, a brush support rod.
  • This arrangement makes it possible to impart to the brush an axial movement of advance in translation and simultaneously a movement of rotation about its axis.
  • the switching means comprise a relay for starting and reversing the direction of travel of the brush rotation motor, which relay is controlled as a function of the state of the position sensors. brush; and an electronic circuit which authorizes control of the relay only if the cassette presence detection means signal the withdrawal of a cassette.
  • the electronic circuit comprises a transistor, the base of which is connected to the emitter, itself grounded, by a resistor and a capacitor in series, the common point of the resistor and the capacitor being itself - even connected via a cassette presence contact either to a voltage supply source, or to the terminal of the relay coil which is not connected to earth.
  • the cleaning device is arranged in a casing under the read head and the brush is located in the rest state under an opening formed in said casing.
  • Figure 1 makes it possible to understand the mechanical principle of the movement of the retractable cleaning brush 8 which comes into contact with a read head constituted by a magnetic cell 9, after each removal of the cassette from the support plate of the cassette player apparatus on which is mounted the cleaning device according to the invention.
  • the stop 5, integral with the brush 8 is in contact with a position sensor such as a micro-contact 6.
  • the brush 8 is then in a retracted position.
  • the detection of the removal of a cassette then triggers the starting of the DC motor 1 which drives a belt 4 guided by idler pulleys 2 and 3 and capable of communicating a movement both to the brush 8 and to the stop 5 so as to bring the brush 8 into contact with the front face 91 of the read head 9 which is designed to cooperate with a magnetic strip.
  • a second position sensor 7 such as a microswitch
  • FIGS. 3 and 4 show an exemplary embodiment in which the assembly of the cleaning device is arranged under a casing 90 above which the magnetic reading cell 9 is mounted.
  • the cleaning device is mounted on a support 100 and comprises a brush 8 capable of passing through an opening 92 formed in the casing 90 to come into the working position (FIG. 4).
  • the brush 8 which can be removable, is fixed to a rod 51 sliding in a guide piece 111 secured to the support 100.
  • the rod 51 is extended at its rear part by a threaded rod 41 made integral, at its free end, d 'a receiving pulley 3 using a fixing part 3a.
  • the pulley 3 is rotated by a belt 4 engaged on a pulley 2 which is itself integral with the output shaft of the motor 1 mounted on the support 100.
  • the threaded rod 41 is engaged in a threaded hole 114 formed in a fixed part 113 mounted with an arm 112 on the support 100.
  • the rotation drive of the pulley 3 thus makes it possible to communicate with the rod 51 and with the brush 8 not only a rotational movement on themselves, but also a movement controlled in advance in the axial direction of the rods 41, 51.
  • the stop 5 secured to the rod 51 cooperates with the upper and lower limit switch micro-contacts 7 and 6 mounted on the support arm 112 on either side of the stop 5, in order to limit the stroke of the rod 51 and cause the reversal of the direction of operation of the motor 1 and therefore the direction of advance of the rod 51.
  • FIG. 2 shown in solid line, the states of the micro-contacts 7 and 6 at the end of race when these are in the rest state, that is to say are not requested by the stopper 5.
  • the state of the contacts 7 and 6 when these are touched by the stopper 5 is shown in broken lines.
  • the contact 18 for detecting the presence of a cassette in the player-recorder device is shown in solid line in its rest state corresponding to the absence of cassette and in broken line in its state corresponding to the presence of a cassette in the unit.
  • a relay 11 comprising a coil 11 a and two movable contacts 11b, 11c makes it possible to reverse the polarity of the supply voltage at the terminals of the motor 1 in order to reverse the direction of rotation of the latter in the manner which will be explained below.
  • the reference numerals 21 to 38 denote the different connection terminals of the contacts 6, 7, 18 and 11b, 11c.
  • the electronic control circuit cooperating with the various contacts and ensuring the operation of the relay 11 according to a predetermined sequence making it possible to return the cleaning brush 8 back and forth each time a cassette is removed, can be produced in a particularly simple manner.
  • a transistor 14 whose collector is connected by a resistor 15 to the power source, and the emitter is grounded, can deliver on its collector an output signal representative of the presence or absence of a cassette .
  • the base of transistor 14 is connected to one end of a resistor 16, the other end of which is connected on the one hand to ground via a capacitor 13 and on the other hand to terminals 21. and 23 of the cassette presence contact 18.
  • the terminal 24 of the contact 18 is itself connected via a resistor 17 to the positive pole of the motor supply 1.
  • the terminal 22 of the contact 18 is itself connected to the terminals 26 and 27 of the contact 7 high limit switch.
  • the terminal 28 of the contact 7 is connected to the end of the coil 11a not connected to ground and the terminal 25 of the contact 7 is connected to this same end of the coil via a diode 12.
  • the terminals 29 and 38 of the bottom limit switch 6 and of the switch 11b, 11c are connected to ground.
  • the terminals 35 and 36 of the switch 11b, 11c are connected to the positive pole of the motor supply 1.
  • the terminals 30 and 33 of the contact 6 and of the switch 11b, 11c are connected together, and the terminals 34, 37 of the switch 11b, 11c are connected to motor 1.
  • the operation of the circuit of FIG. 2 is as follows.
  • the cassette presence contact 18 is in its position shown in dotted lines and connects the terminals 23 and 24.
  • the positive supply voltage of the motor 1 (for example 12 volts) is then brought to the base of transistor 14 via resistors 17 and 16.
  • the transistor 14 is saturated, the output on the collector is at OV and the capacitor 13 is charged.
  • the cassette presence contact 18 returns between the terminals 21 and 22 in the position shown in solid lines.
  • the brush 8 is then in its low position, only the bottom limit switch 6 is in its activated position between the terminals 31 and 32 while the top limit switch 7 is in its rest position between the terminals 27 and 28.
  • the capacitor 13 is thus placed in series with the coil 11 a of the relay 11 and discharges in the latter the diode 12 preventing a direct return of the current to ground.
  • the switch 11a, 11b then passes from its position shown in FIG. 2 to the position where the terminals 34 and 35 are connected by the contact 11c and the terminals 37 and 38 are connected by the contact 11b.
  • the motor 1 is excited and drives the brush 8 so as to move the latter upwards.
  • the stop 5 leaves the contact 6 which is switched to its position shown in solid lines between the terminals 29 and 30.
  • the stop 5 When the brush 8 has arrived in its working position in contact with the surface 91 of the read head, the stop 5 also comes into contact with the top limit microswitch 7 which passes into its position shown in broken lines between terminals 25 and 26. Thanks to the direct connection between terminal 25 and earth, the input of the coil 11a is earthed and the contacts 11b, 11c return to their initial position respectively between terminals 37 and 36, and between terminals 34 and 33, in the position shown in FIG. 2. The direction of operation of the motor 1 is then reversed, and the brush descends to its initial position where the stop 5 comes into contact with the contact 6 and, returning it to its activated position shown in broken lines between terminals 31 and 32, disconnects the power supply to the motor. The system is then ready to operate again as soon as a cassette has been replaced in the device, which will recharge the capacitor 13, then removed from the device, which will trigger the back and forth movement of the brush. 8 by the return of the contact 18 in its position shown in solid lines.
  • control system described above is thus particularly simple and robust and very inexpensive to manufacture, since the active elements are few.
  • equivalent electronic circuits could be substituted for the assembly shown in FIG. 2 in order to obtain the same control sequence for motor 1.

Landscapes

  • Nozzles For Electric Vacuum Cleaners (AREA)
  • Auxiliary Devices For Machine Tools (AREA)
  • Automatic Analysis And Handling Materials Therefor (AREA)
  • Supporting Of Heads In Record-Carrier Devices (AREA)
  • Cleaning In General (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)

Claims (5)

1. Automatische Reinigungsvorrichtung eines Magnet-Lesekopfes eines Magnetbandes für ein Kasettenaufnahmegerät, umfassend eine einund ausziehbare Bürste (8), die mit dem Lesekopf (9) in Kontakt gelangen kann, Mittel (18) zum Nachweisen des Vorhandenseins einer Kassette im Gerät und von den Mitteln (18) zum Nachweisen des Vorhandenseins einer Kassette im Gerät gesteuerte Mittel (1 bis 4) zum Antreiben der ein- und ausziehbaren Bürste (8), dadurch gekennzeichnet, daß sie weiters Positionsfühler (6, 7) der Bürste (8), die aus feststehenden Endlage-Mikrokontakten gebildet sind, welche mit einem Anschlag (5), der mit einer senkrecht zum Lesekopf (9) verschiebbaren Trägerstange (51,41) der Bürste (8) verbunden ist, zusammenwirken, und mit den Fühlern (6, 7) in Verbindung stehende Umschaltmittel (11 bis 17) zu den Mitteln (18) zum Nachweisen des Vorhandenseins einer Kassette und zu den Mitteln (1 bis 4) zum Antreiben der ein- und ausziehbaren Bürste zur Gewährleistung des Antriebs der einund ausziehbaren Bürste (8) auf selektive Weise in Rotation und in Verschiebebewegung bei jeder Entnahme einer Kassette umfaßt, sodaß die Bürste (8) mindestens eine Hin- und Herbewegung macht, in deren Verlauf sie unter Ausführen einer Rotationsbewegung um sich selbst mit dem Magnetkopf (9) in Kontakt gelangt, und daß die mit der Bürste (8) in Verbindung stehenden Antriebs- und Bewegungsübertragungsmittel einen Gleichstrom-Elektromotor (1), ein System aus Rollen und Treibriemen (2, 3, 4), eine feststehende Führungsmutter (114) und eine Gewindestange (41), die einerseits mit einer angetriebenen Rolle (3) und anderseits mit der Trägerstange (51) der Bürste (8) verbunden ist, umfassen.
2. Reinigungsvorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Umschaltmittel (11 bis 17) ein Relais (11) zum Ingangsetzen und zur Laufrichtungsumkehr des Motors (1) für den Rotationsantrieb der Bürste (8) umfassen, welches Relais (11) in Abhängigkeit vom Zustand der Positionsfühler (6, 7) der Bürste (8) gesteuert ist, und einen elektronischen Kreis (12 bis 17) umfassen, der die Steuerung des Relais (11) nur dann gestattet, wenn die Mittel (18) zum Nachweisen des Vorhandenseins einer Kassette die Entnahme einer Kassette signalisieren.
3. Reinigungsvorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß der elektronische Kreis (12 bis 17) einen Transistor (14) umfaßt, dessen Basis mit dem Emitter verbunden ist, der selbst über einen Widerstand (16) und einen Kondensator (13) in Serie auf Masse geschaltet ist, wobei der gemeinsame Punkt des Widerstandes (16) und des Kondensators (13) wiederum über einen Kontakt (18) des Vorhandseins einer Kassette entweder mit einer Spannungsquelle oder mit der Klemme der Spule (1 la) des Relais (11) verbunden ist, die nicht auf Masse geschaltet ist, wenn sich der Kontakt (7) der oberen Endlage in seiner Ruheposition befindet.
4. Reinigungsvorrichtung nach Anspruch 3, dadurch gekennzeichnet, daß die Positionsfühler (6, 7) der Bürste (8) durch Endlage-Kontakte gebildet sind, daß der untere Endlage-Kontakt (6) in erregtem Zustand eine Verbindung zwischen der Masse und einer mittels des Relais (11) mit einer Speiseklemme des Motors (1) verbindbaren Klemme herstellen kann, und daß der obere Endlage-Kontakt (7) in erregtem Zustand eine Verbindung zwischem dem Kontakt (18) des Vorhandenseins einer Kassette und der Klemme der Spule (11 a) des Relais (11), die nicht auf Masse geschaltet ist, gewährleisten kann.
5. Reinigungsvorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß sie in einem Gehäuse (90) unter dem Lesekopf (9) angeordnet ist und sich die Bürste (8) im Ruhezustand unterhalb einer im Gehäuse (90) vorgesehenen Öffnung (92) befindet.
EP83401703A 1982-08-26 1983-08-24 Automatische Reinigungsvorrichtung eines Lesekopfes eines Kassettenaufnahmegerätes Expired EP0102897B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83401703T ATE25440T1 (de) 1982-08-26 1983-08-24 Automatische reinigungsvorrichtung eines lesekopfes eines kassettenaufnahmegeraetes.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8214663A FR2532459A1 (fr) 1982-08-26 1982-08-26 Dispositif de nettoyage automatique d'une tete de lecture d'appareil enregistreur a cassette
FR8214663 1982-08-26

Publications (2)

Publication Number Publication Date
EP0102897A1 EP0102897A1 (de) 1984-03-14
EP0102897B1 true EP0102897B1 (de) 1987-02-04

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EP83401703A Expired EP0102897B1 (de) 1982-08-26 1983-08-24 Automatische Reinigungsvorrichtung eines Lesekopfes eines Kassettenaufnahmegerätes

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EP (1) EP0102897B1 (de)
AT (1) ATE25440T1 (de)
DE (1) DE3369760D1 (de)
FR (1) FR2532459A1 (de)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2201027A (en) * 1987-02-11 1988-08-17 Pacevault Ltd Apparatus for use in cleaning a tape head
AT395488B (de) * 1991-03-18 1993-01-25 Philips Nv Geraet zum aufzeichnen und wiedergeben von signalen mit mindestens einem rotierenden magnetkopf
US6067211A (en) * 1996-04-03 2000-05-23 International Business Machines Corporation Oscillating magnetic head and stationary brush cleaning apparatus
US5793580A (en) * 1996-06-18 1998-08-11 International Business Machines Corporation Mechanically actuated head cleaner for magnetic tape drive
US6021026A (en) * 1998-04-08 2000-02-01 Storage Technology Corporation Cleaning cartridge
JP3209203B2 (ja) * 1998-12-25 2001-09-17 日本電気株式会社 ヘッドクリーナ
JP2001101629A (ja) * 1999-09-27 2001-04-13 Nec Yonezawa Ltd 磁気ヘッドクリーナ
US6624960B1 (en) * 2000-03-10 2003-09-23 Exabyte Corporation Current sensing drum/cleaning wheel positioning method and apparatus for magnetic storage system
US7099101B2 (en) 2004-11-01 2006-08-29 International Business Machines Corporation Apparatus, system, and method for determining contact with a magnetic head in a tape drive
JP2006155683A (ja) 2004-11-25 2006-06-15 Mitsumi Electric Co Ltd 記録再生装置

Family Cites Families (7)

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Publication number Priority date Publication date Assignee Title
US3366390A (en) * 1965-04-28 1968-01-30 Ibm Method for removing microscopic dust particles
US3595584A (en) * 1965-05-17 1971-07-27 Iit Res Inst Transducer apparatus
US3593584A (en) * 1969-03-06 1971-07-20 Solomon Jack Automatic testing units for pipe fittings
US3636276A (en) * 1969-11-26 1972-01-18 Tenna Corp Tape cartridge player transducer head cleaner
US3979773A (en) * 1973-04-28 1976-09-07 Tokyo Shibaura Electric Co., Ltd. Magnetic recording and reproducing apparatus
DE2423288A1 (de) * 1974-05-14 1975-11-27 Grundig Emv Einrichtung an tonbandgeraeten
US3964104A (en) * 1975-03-31 1976-06-15 International Business Machines Corporation Intermittent cleaner for rotating magnetic head

Also Published As

Publication number Publication date
EP0102897A1 (de) 1984-03-14
ATE25440T1 (de) 1987-02-15
FR2532459A1 (fr) 1984-03-02
DE3369760D1 (en) 1987-03-12

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